Means for supporting gore bars in flasks



Oct. 30, 1928. Re. 17,121

J. R. MCWANE MEANS FOR SUPPORTING CORE BARS IN FLASKS Original Filed May1925 2 Sheets-Sheet 1 J. R. M WANE MEANS FOR SUPPORTING CORE BARS INFLASKS Oct. 30, 1928.

Original Filed May 9, 1925 2 Sheets-Sheet 2 Reissued Oct. 30, 1928.

JAMES R. M'GWANE, 0F BIRMINGHAM, ALABAMA.

MEANS FOR SUPPORTING CORE BARS IN FLASKS.

Original No. 1,601,450,

This invention relates to method of and means for supporting core barsin flasks, and is designed as an improvement on the structure shown anddescribed in Patent No. 1,578,083, dated March 23, 1926, on means forsupporting core bars in flasks.

The object is to improve and to strengthen the means for holding theelongated core bars, with the sand cores thereon, which are necessarilyused in the making of cast iron pipe or other similar tubular castingsby the horizontal method of tasting, wherein the cope and drag sectionscomprising the flask are fitted together in a horizontal position, withthe two halves of the mold formed therein and the cores in positionready for the pouring of the metal.

Another object is to provide holding or supporting means which engagethe ends of the core bars and clamp the bars sufficiently to stiffen thesame andtake up any sagging and resist movement at their intermediateportions due to their relatively great length and weight, it beingunderstood that the use of ordinary chaplets is entirely dispensed within the present method of supporting the cores. By supporting the corebar at two points on each end and clamping the bar down on these twopoints, the bar becomes what is known in mechanics as a continuous beam,as opposed to a. simple beam, and thereby is made much more rigid. v

A further object is to provide means which may be adjusted to impart adownward fieX- ing of the core bars at their intermediate portions sothat the latter are eccentrically disposed relative to the surroundingwalls of the molds, such adjustment being made with a nicety sufiicientto allow said core bars with the cores thereon to be forced upwardly tothe exact center of the molds by the incoming flow of the molten metal.which tends to float the bars and cores, and thus produce castingshaving walls of uniform thickness, such flexing having the effect ofplacing the core bars under sufficient tension to prevent any furthersagging of the same, prior to the pouring operation.

A full and complete understanding of the invention may be obtained froma consideration of the following detailed description, taken inconnection with the accompanying drawings forming a part of thisspecification, it being understood that while the drawings showpractical forms of the. invention, the latdated September 28, 1926,Serial No. 29,084, filed May 9, 1925. Application for reissue filed July25, 1928.

Serial No. 295,284.

ter is not to be confined to strict conformity with the showing thereof,but may be changed or modified, so long as such changes or modificationsmark no material departure from the salient features of the invention,as speeifically pointed out in the appended claims. I

In the drawings, in which similar reference characters designatecorresponding parts throughout the several figures Figure 1 is a sideelevation partly in section of a flask having an embodiment of theinvention applied thereto and showing the core being supported and aportion of the casting surrounding the core.

Figure 2 is a plan view of the drag section of a double pipe flask, thecores being held in position by the improved means. 7

Figure 3 isan end elevation of the flask drawn on a larger scale.

Figure 1- is a transverse section taken on the line 4-4 of Figure 1.

Figure 5 is a detail perspective view of the clamping yoke used intensioning the core bars. a

Figure 6 is an end elevation of a drag section having slightly modifiedmeans for engaging the ends of the core bars.

Figure section, of the same.

Referring to the drawings, there is shown a double flask used in themanufacture of cast iron pipe by the horizontal method, the said flaskcomprising a lower or drag section 1 which'is adapted to be placed uponthe floor of the foundry in an inverted position, and a superimposedcope section 2, formed in all main respects the same as the dragsection, except with some minor details, and adapted to rest upon thedrag in reverse position, and to be rigidly connected to the same bysuitable clamps, or in any other desired manner, to prevent relativemovement of the flask. sections during the pouring of the metal.

The cope and the drag sections are each formed of suitable cast metal soas to stand repeated use, and are in. the form of boxes open at the topand bottom, their abutting edges being considerably wider than theirother edges, as clea ly shown in Figures 3 and 4.

Each section is provided with a plurality of spaced and alinedtransverse webs 3 and 3 integrally joining the longitudinal side wallthereof to strengthen the same and to hold the mold sand in posltion,there being 1 is an enlarged detail partly in suitable, centrallydisposed, semi-circular openings 4 formed in the long, or abutting edgesof the transverse webs, and also the end walls, which, when the twosections are properly positioned for use, form complete circularopenings of sufficient diameter to permit of a continuous sand mold tobe made throughout the length of the casting.

Each drag section is formed, at each end, with a longitudinally disposedarm 5, which is integrally connected at its outer end, to the inner faceof the end wall 6 of the drag, and at its inner end to the next adjacenttransverse web 3?, the arm being located substantially midway betweenthe sides of the drag, and having formed in its lower face a recess 7,provided with a narrow entrance slot 8, for receiving the shank of anadjusting tie bolt to be described.

Each drag section is also provided at each end with a pair of outwardlyextending, horizontally disposed lugs 9, preferably formed integrallytherewith and slightly below the openings 4 therein, the centers of saidlugs lying in the same vertical planes with the centers of said openingsand the lugs being provided with strengthening webs 10 be neath thesame.

Vertically disposed set screws 11 are adapted to be threaded through theouter portions of the lugs 9, the active ends of the same being directedupwardly to contact beneath the exact centers of the extended ends oftubular core bars 12, which contact with the arcuate walls 13 of thetransverse webs 3 which have been machined as seats for the core bars12.

The core bars 12 with t-hecores proper 13* formed of suitable sandthereon, are lowered into the lower half 14 of the mold already formedin the drag section and onto the machined seats 13, an exact positioningof the ends of the core bars being thus effected when the core bars areseated.

Adapted to coact with the aforesaid arms at each end-of the flask is ayoke member 15, formed preferably of a heavy, solid casting of propermetal, and provided on its under face, at each end, with a flat seat 16adapted to press down upon the core bars where they extend beyond theends of the sand core proper. The yokes are further provided with endenlargements 17 of arcuate form on their upper faces to strengthen theterminals of the same, and a central, vertical aperture 18 extendstherethrough for the reception of a tie bolt 19, having a head 20 at itslower end which is adapted to be easily and quickly fitted into theaforesaid seat or recess 7, in the arm 5 beneath thesame, by movingthebolt transversely into the entrance slot 8, as will be readilyunderstood (Figure 4;).

The yokes 15 occupy the spaces in the upper or cope section 2 betweenthe. end walls 3 thereof, when properly positioned upon thecore bars intransverse relation to the flask, said space, in each section, beingfree of the mold sand, as clearly shown in the drawings. With the headof the tie bolt engaged in the seat 7 and traversing the hole inthe'yoke, as described, the nut 21 is turned at each end of the flask tocause the core bars to be pressed down in the machined seats 13. ie setscrews 14 do not engage the core bars until after the yokes 15 arefastened down on the core bars. Tightening of the yokes causes aleverage between the yokes on top of the core bars and the machinedseats 13 underneath the core bars, the seats 13 acting as fulcrums, andthe downward pressure of the yokes raising the intermediate portions ofthe core bars. Usually, and preferably, the intermediate portions of thecore bars are raised sufficiently to compensatefor the natural sag ofthe core bars due to their weight and length, thereby making the corebars truly coaxial with the molds throughout their length.

After the yokes are fastened down and the intermediate portions of thebars are thus raised, the set screws 11 are adjusted. 'The pressure ofthese screws upward causes the yokes in turn to act as fulcrums, settingthe intermediate portions of the bars slightly below center to apredetermined extent, so that the pressure of the molten metal willfloat the bars back to center instead of out of center, thus assuringuniformity in the thickness of the walls of the pipe or other tubularcasting. I

Great pressure may be brought to bear upon the end portions of the corebars to cause them to be supportedrigidly in position with the desiredamount of tension therein, and with a predetermined deflection, by meansof the yoke acting in opposition to the set screws, and this degree ofpressure may be equally distributed between the two core bars by theaction of a single tie bolt, which has proven, in practice, to be agreat advantage, as the two castings are made alike and the oneadjustment serves for both.

In Figure 6 there is shown a drag section 22 having a substantiallysemi-circular cope bar opening 23 formed therein with vertical, parallelside walls 24 at its upper edges. At the lower ends of the verticalportions, there are formed undercut recesses 25 and the side walls arefurther provided with vertical grooves 26, into which there are adaptedto be driven out nails or other thin wedges 27, the lower ends of whichmay ormay not engage with the rounded surface of the openings and bebent inwardly, as shown, when the core bars are in positioni This makesa positive iron-to-iron engagement and effectually resists lateralmovement of the-intermediate portions of the core'bars, due to thepressure of the inflowing metal.

7 From the foregoing it will be seen that ill! [ill

simple means have been provided which may be readily incorporated in thedrag sections of flasks for the manufacture of cast iron pipe or othertubular castings, said means serving to impart a deflection to theintermediate portions of the core bars to be overcome by the action ofthe metal in floating the same. The continuous beam action re ferred tonot only causes the core bars to resist the tendency to move upward butalso prevents sidewise movement to a prohibitively objectionable extent,thus insuring substantial uniformity of section throughout the entirelength of the casting.

hat is claimed is 1. Means for supporting a core bar in. a flaskcomprising a bottom support consisting of machined webs, and independentelements carried by the flask and bearing on top of the core bar,properly spaced from the webs in the direction of the ends of the corebar, and adapted to exert a leverage to raise the latter at its centralportion.

2. Means for supporting a core bar in a flask comprising a bottomsupport consisting of machined webs, independent elements carried by theflask and exerting pressure on top of the core bar in spaced relation tothe webs in the direction of the ends of the core bar to exert aleverage to raise the latter at its central portion, and means outsideof said independent elements for lifting the terminals of the core barto overcome the raising of said central portion and deflect the same. 3.Means for supporting a core bar in a flask comprising verticallyadjustable elements mounted near the ends of the flask to engage theextended ends of the core bar and constitute an end support for thelatter, and independent elements located within the flask and bearing ontop of the core bar and adapted to exert pressure thereon to depress thelatter at its central portion, both the said adjustable elements and thesaid independent elements being carried wholly by the drag section ofthe flask.

4:. Means for supporting core bars in a double flask comprising lugsformed on the ends of the drag section to the flask directly beneath theextended ends of the core bars, screws mounted in said lugs to contactwith the extended ends of the core bars, a yoke arranged within theflask and bearing upon the top sides of the core bars, and means forexerting a downward pressure on said yoke to deflect the core bars attheir centers, said means being connected to the drag section of theflask.

5. Means for supporting and centering a core in a flask comprisingvertically adj ustable elements arranged near the ends of the dragsection to contact beneath the ends of the core bar and deflect thesame, separate elements located within the cope section and bearing ontop of the, core bar adjacent to the ends thereof, and means connectingthe last named elements to the drag section and aaapted to draw theseparate, elements down upon the bar.

6.v Means for supporting cores in a double flask to resist theirfloating upon the molten metal, said means comprising outstanding lugsformed on the ends of the arag sections of the flask and directlybeneath the extended ends of the core bars, set screws threaded upwardlythrough said lugs to contact with and exert pressure upon the core bars,a yoke arranged adjacent to the inner face of each end wall of the copesection and bearing upon the top sides of the spaced core bars in spacedrelation to the screws, and means for exerting a downward pressure onsaid yokes to deflect the bars at their centers, said means beingconnected to the drag section. of the flask. I

7. Means-for supporting spaced, parallel cores in a double flask andresisting their rising at the central portions thereof by floating onthe molten metal as the latter is poured, s 'u means comprising upwardlyadj ust-able supporting abutments carried by the drag section of theflask to contact beneath the extended ends of each core bar beyond theend walls of the drag, separate and removable yokes arrangedtransversely within the end walls of the cope section and adapted tobear upon the core bars in spaced relation to the supporting abutments,and a single, centrally disposed bolt connectingeach yoke to the dragsection and adapted to draw the same tightly down upon the core bars.

8. A double flask for castingpipe or othertubular objects and havingcope and drag sections provided with core openings, said drag sectionhaving outwardly extending longitudinally disposed lugs carried by theend walls thereof and located beneath the core openings, verticallyadjustable set screws mounted in the lugs'and adapted to contact withand exertpressure upon, the ends of the core bars, a longitudinallydisposed arm formed at each end of the drag section, said arms havingseats for removably receiv ing bolt heads, a separate removable yokearranged transversely of the drag, the ends of the same resting on the,core bars within the cope section, said yokes each having a central,vertical aperture, and a tie bolt traversing the aperture of each yokeand provided with a head to be removably seated in the. longitudinal armand having anut to bear upon the yoke and bind the same on the. corebars in a downward direction in opposition to the set screws.

9. A double flask for casting pipe'or the like composed of cope and dragsections having core openings for permitting the ends of the core barsto extend ther-ethrough, vertically adjustable abutments mounted on thethe core bars in an upward direction, the core openings in the dragsection having vertical grooves at the sides of the core bars, andwedges adapted to be driven into said grooves to bear against the sidesof the bars to resist side movement thereof.

10. In a double flask for elongated tubular castings and composed of acope and a drag section having complementary core bar openings,adjustable supports arranged exteriorly on and in spaced relation totheenos of the I drag section and adapted to contact with the ends ofthe core bars where extended through said openings, longitudinal armsformed integrally with the drags and extending substantially along thelongitudinal center line thereof from the inner faces of the end wallsto the next adjacent transverse webs, said arms each having a seatprovided with a transverse entrance opening, a yoke adapted to be placedwith each end resting upon a core bar at each end of the same after thecore bar-shave been positioned, said yokes each having a central bolthole, tie bolts having heads to enter said seats and to traverse theyokes, and nuts for drawing the yokes down on the core bars.

11. Means for supporting elongated core bars in a horizontal position inflasks without the use of chapl'ets to resist movement of the same,comprising supporting means for supporting the core bar at points spacedfrom each end, means for exerting downward pressure on top of the bar ateach end outside said supporting means so as to cause the bar to fulcrumon the supporting means and overcome sagging therein, and means forexerting upward pressure beneath each terminal of the bar to overcomethe downward pressure and depress the center of the bar beneath the1011- gitudinal axis of the mold, all of said means being carried by thedrag section of the flask whereby when floating action takes place onthe incoming molten metal it will bring the bar and core substantiallyin axial alignment and secure substantially uniform thickness in thewalls of the casting.

12. Apparatus of the character described comprising, in combination, aflask having machined webs near its opposite ends, so shaped and of suchdimensions as to provide seats for a core bar which is thereby heldcoaxial with the mold, exceptfor intermediate sagging due to its weight;and adjustable elements at the opposite ends of the flask for exertingpressure on the core bar from above and below the same to deflect theintermediate portion of the core bar to the extent desired; saidadjustable elements being spa-ced'from each other longitudinally of thecore bar and being located outside of the machined webs.

13. Apparatus of the character described comprising, in combination, aflask whicn is capable of receiving two core bars; and means connectedto the flask at each end for exerting transverse pressure simultaneouslyupon both core bars near their ends, said means being so constructed andarranged as to equalize the pressure on thecore bars, thereby to deflectthem intermediately to an equal extent.

14. Apparatus oi the character described comprising, in combination, aflask which is capable of receiving two core bars; and a yoke connectedby a tie bolt to the flas at each end for exerting transverse pressureon both core bars near their ends, simultaneously and equally, when thetie bolt is tightened, thereby effecting deflection of both core bars bya singie ustment at each end of the flask.

15. Apparatus of the character described comprising, in combination, aflask having machined webs near its opposite ends, so shaped and of suchdimensions as to provide seats for a core bar whichis thereby heldcoaxial with the mold, except for intermediate sagging due to itsweight; adjustable elements at the opposite ends of the flask forexerting pressure on the core bar from above and below the same todeflect the intermediate portion of the core bar to the extent desired;said adjustable elements being spaced from each other longitudinally ofthe core bar and being lo cated outside of the machined webs; andadjustable means interposed between the flask and the core bar andlocated near said adj ustable elements and adapted, when tightened, todeflect the core bar sidewise to compensate for the thrust of the moltenmetal as it flows into the mold.

16. Apparatus of the character described comprising, incombination, aflask having adjustable means at each end I for exerting a pressure on acore bar from above; a pair of wedges adapted to be driven between theflask and the core bar to exert a pressure on the core bar along linessubstantially horizontal; and a screw on each end of the flask outsidethe adjustable means and adapted to exert an upward pressure on the corebar, with said adj ustable means then serving as fulcrums :tor the corebar, to effect downward deflection of the core bar; the wedges, whendriven in tightly, causing the core bar to be deflected transversely.

JAMES R. MoWANE.

